1 6 how are solutes dissolved

Launch: 1/6   Grab your binder and immediately take a seat!

  Place launch paper and HW (practice questions) on your desk.

  Yesterday’s Exit Slip Data:

  Today’s Objective: I can describe the dissolving process at the molecular level.

92%

Launch: 1/6   Grab your binder and immediately take a seat!

  Place launch paper and HW (practice questions) on your desk.

  Yesterday’s Exit Slip Data:

  Today’s Objective: I can describe the dissolving process at the molecular level.

84%

Launch: 1/6   Grab your binder and immediately take a seat!

  Place launch paper and HW (practice questions) on your desk.

  Yesterday’s Exit Slip Data:

  Today’s Objective: I can describe the dissolving process at the molecular level.

88%

Launch: 1/6   Grab your binder and immediately take a seat!

  Place launch paper and HW (practice questions) on your desk.

  Yesterday’s Exit Slip Data:

  Today’s Objective: I can describe the dissolving process at the molecular level.

-

Launch 1/6 1.  In 1-2 sentences, define a solute and a solvent.

Launch 1/6 2.  Which of the following statements about solutions

is correct? a.  In a solution, the solute is dissolved into the solvent. b.  In a solution, the solvent is dissolved into the solute. c.  In a solution, the solvents are usually a solid.

d.  In a solution, the solutes and solvents are unequally mixed.

Launch 1/6 3.  A teaspoon of dry coffee crystals dissolves when

mixed in a cup of hot water. This process produces a coffee solution. The original crystals are classified as a

a.  solute.

b.  solvent. c.  reactant. d.  product.

New Changes for the New Year!   Late homework policy

  Late homework in now due the day after you return   Notes packets, handouts, and practice questions will

can be found:   at the back of the classroom

New Changes for the New Year!   Class consequences

1.  Name on board 2.  Take a break

3.  Call home 4.  Sent to Mr. Wandera

  Rules: still the same 7

January Calendar Jan 2010 (Pacific Time)LPS Chem, Assessments, Unit Plan

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4 5 6 7 8

11 12 13 14 15

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Solutions

Solutions Acids and Bases

Quiz

MLK No School Acids and Bases

End of Semester

Quiz

Acids and Bases

Unit #6 Exam

Monday Tuesday Wednesday Thursday Friday

How are solutes dissolved? Mr. Heffner

1/6/10

Review: What is a solution?   A solution is…

  a homogeneous mixture made up of a solute and a solvent

• a solid • is dissolved • molecules don’t move

+ = solvent solution solute

• a liquid • does the dissolving • random movement

How are solutes dissolved?   Solvent molecules randomly hit the solute and attack!

  Example:   Solute = table salt (NaCl)

  Held together by ionic bonds

  Solvent = water   Polar solvent: unequal sharing

–

+

How are solutes dissolved?   Attack!

  http://www.mhhe.com/physsci/chemistry/essentialchemistry/flash/molvie1.swf

  Movie questions: 1.  What is the solute?

2.  What is the solvent? 3.  In your own words, describe how the salt was dissolved?

How are solutes dissolved?

water molecules attack solute

overcome the attractive forces of the solid

dissolve the ion

Activity   In 3-4 sentences, describe what we just acted out.

  Who were the solutes and what were the doing?   Who were the solvents and what did they do?

Practice Questions   Practice question worksheet

Exit Slip

1.  In a solution, a.  the solvent particles are attacked by the solute. b.  the solvents are dissolved by the solutes. c.  the two substances are not evenly mixed throughout.

d.  the solutes are dissolved by the solvents.

Exit Slip 2.  Which of the following is correct statement.

a.  In a solution, the solute molecules randomly move around while the solvent molecules don’t move.

b.  In a solution, the solvent molecules randomly move around while the solute molecules don’t move.

c.  A solution is an example of a heterogeneous mixture.

d.  Solvents are usually solids

Exit Slip 3.  Which of the following is a correct statement about

the dissolving process? a.  The solvent molecules randomly bump into the

solutes and attack. b.  In a solution, the solvent is dissolved into the solute.

c.  In a solution, the solvents are usually a solid. d.  In a solution, the solutes and solvents are unequally

mixed.

Exit Slip 4.  An ionic salt (KBr) is dissolved into water. In this

example, a.  both KBr and water are solvents. b.  KBr (the solvent) is attacked by water (the solute),

splitting it into K+ and Br– ions.

c.  KBr (the solute) is attacked by water (the solvent), splitting it into K+

and Br– ions.

d.  the KBr attacks the water and dissolves it into solution.

Exit Slip 5.  If the attractive forces among solid particles are

less than the attractive forces between the solid and the liquid, the solid will

a.  probably form a new precipitate as its crystal lattice is broken and reformed.

b.  be unaffected because the attractive forces within the crystal lattice are too strong for dissolution to occur.

c.  begin the process of melting to form a liquid.

d.  dissolve as particles are pulled away from the crystal lattice by the water molecules

Homework   Finish practice questions